エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
ISSN-L : 0912-2834
研究論文
大気窒素化合物の日本海への沈着が表層クロロフィルa濃度に及ぼす影響
竹谷 文一相田 真希関谷 高志山地 一代池田 恒平松本 和彦本多 牧生金谷 有剛
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ジャーナル フリー
電子付録

2021 年 36 巻 1 号 p. 46-54

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The sensitivity of ocean phytoplankton (chlorophyll-a concentration) to deposition of atmospheric inorganic nitrogen compounds over Japan Sea was investigated using a 3-D lower trophic-marine ecosystem model (COCO-NEMURO) combined with an atmospheric regional chemical transport model (WRF-CMAQ). The monthly mean values for the wet and dry deposition of inorganic nitrogen compounds including gases (HNO3 and NH3) and aerosol particles (NO3 and NH4) over the Japan Sea were determined using the WRF-CMAQ. The results indicated that the total flux of inorganic nitrogen compounds was in the range of 82–302 μmol/m2/day and wet deposition was dominant in all season. These values were input into the ocean surface in NEMURO as a new nitrogen nutrient source from atmosphere. The annual average of surface chlorophyll-a concentration over Japan Sea was increased from 0.26 to 0.35 mg/m3. The chlorophyll-a concentration in summer season was ~2.1, while that in winter season was ~1.1, times higher than that without atmospheric inorganic nitrogen compounds deposition, indicating that the atmospheric deposition of inorganic nitrogen compounds significantly influence surface chlorophyll-a concentration in summer season.

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